Spring-roller for curtains



` `.To all whomat mag/concern i A l. Be it known that we, JOHNHARTsHotRN.

dUmmm),sTALrEs 4PATEN'i OFFICE e JOHN HARISHORN AND JACOB HARTSHORN, `OFBOSTON, MASSACHUSETTS.

sPRING-ROLLER Fos cUR'rArNs.

speeincaioa ofLettersPatent-No. 12,792, dated May 1, 1855.

@fand JAooBI-IARTsHoRu, both of Boston, in i the county of Suffollrfand`State of Massa- `following is a full, cleaijand` exact descrip` tion,referencefbeing had` tothe annexed drawings, in which- ,.gchusetts, haveinvented anew and useful Improvement in Curtain-Fixtures, of which theFigure l isa frontjview of a'curtain with u our improvementsattached."Fig. 2 a section onthe linegAA ofFigJl." Figaview of `the rodl whichcarries the spring that sustains the curtain.` Figz will be referred tohereafter. l i,

`Window curtains have been suspended and balanced byspiralspringscontained l l within the curtain"rod,; therange of such springs"hashowever been `limited by the fact that theendfsof thesprings` wereattached the one t thestationary the otherlto 4 therevolving partfofthe` curtain rod, ,i in

such a manner as `always to!l remainWat a 1 `fixed and`iunvaryingi"dist-ance from` each o other; another consequence ofthis"metho d of securing lthe spring `is that it is apt to `buckleandftwist out of shape, as seen in Fig. 3,11bywwhichtheispring is soondeA strOyed." To remedy these inconveniences `and toVproduce` a springof great range for the length ot` wire and coil employed is the4 objectofour present invention, which consists in securingone end l ofthespring to a :stationary rod which sustains it, the other jbeingniadefastztofa block, whichat the "same time that itis caused to `revolvewith the cylinder, is permitted to slide longitu- Idinally `toallowthei` spring to lengthen or shorten fasitis more orlessV wound up.

`To enable` others skilled in the art tounlderstand our invention` wewill proceed to describe the mannerinwhich wehave carried` it out. f

l `In the accompanying drawings, B is the curtainwhich is attachedto thetncylinder C by the wire @secured to its upper end.

This cylinder.v has a longitudinal slot a along its whole length ofsuficient size only to ad- 1 `mit, the curtain. Immediately beneath this"slot is an enlargedchannel or trough b, into which the Vwirejibisslipped, the curtain being permitted to lproject through the slot a asseen 1n Fig. 2. This slot not being suffi- "ciently large to admit thepassage of the wire, the curtain is held secured to its cylinder;4 D Dare, plugs secured'to each end of the cylinder. i

E is a ratchet wheel secured to the plug D" having apawl F, by'means ofwhich the revolution of the cylinder is regulated.

""G is a stationary rod which iits tightly into the bracket-s H, H andupon which the cylinder C revolves, the plugs D, D revolving freely uponthe rod.

K K are blocks which fit looselyupon the rod G, and are allowed to slidelongitudinally thereon. d are grooves in the circumference of theseblocks into which entersthe projecting trough Z9, and thus these` blocksare caused torevolve with the cyl inder.

.M, M', are rightand left handspiral springs,- theinterior ends of whichare secured to the blocks K, K the exterior ends L being fastened to rodG. When the springs are allowed to run down the blocks K, K',

approach the ends of the rod and the springs expand without interruptionwhereby a greater range of expansion is attained.

When the springs are wound up the length of the coil increases, toaccommodate which the blocks K, K approach each other and thus thebuckling or twisting of the `coil (seen at the right hand in Fig. 3) isavoided; this twisting soon destroys the operation of the spring, andwill invariably take place whenever its normal condition is changedeitherby winding it upr or expanding it, if no pro-vision be made for achange of its effective length.

`What we claim as our invention and desire to secure by Letters Patentis- Attaching one end of the springs to the slidingblock K, K for thepurpose of enablingwthem to increase and diminish in length iastthey areWound up or expanded, in the manner and for the purpose set forth.

JOHN HARTSHORN. JACOB HARTSHORN. Witnesses e SAM. COOPER, JOHN S. Crow.

